What would you change if you could go back in time?

And if you were able to go back in time and change that thing, would you then have changed the path of the future you who went back in time to change the past…which meant the past never changed at all?

It’s the ‘grandfather paradox’ at the heart of time travel. Time travel into the past that is – we are all travelling into an unknown future one second at a time.

South Korean documentary ‘I Bought a Time Machine’ is a clever and moving rumination on the past and our relationship with it.

Time travel and the glorious mind-knots it poses are just one of the fascinating documentaries in this year’s BBC Reels Long Shots Film Festival. There are 6 short documentaries and you can vote for your favourite in the Audience Choice Award. The deadline is midday on Monday 19th September 2022.